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| API | Description | Category | |
|---|---|---|---|
| AES WebLink | Shipment submission and inquiry services | Government | 2008-09-14 |
| AMEE | Avoiding Mass Extinctions Engine - CO2 calculations | Other | 2007-09-21 |
| Australian Business Number Lookup | Australian business number refernece service | Government | 2008-07-02 |
| Cicero | Address-based Lookup Service for Elected Officials | Government | 2007-04-10 |
| Civic Footprint | Political geography lookup for Illinois | Government | 2006-05-19 |
| Democracy In Action | eAdvocacy services for nonprofits | Government | 2007-03-05 |
| FedSpending.org | Database of US government spending | Government | 2007-04-26 |
| Follow The Money | Database of US campaign contributions | Government | 2006-11-02 |
| FreedomSpeaks | United States political data lookup | Government | 2008-10-08 |
| GovTrack.us | US Congress database service | Government | 2008-07-03 |
| GovTracker | Rhode Island state data services | Government | 2006-07-19 |
| Library of Congress Subject Headings | Access to the Library of Congress Subject Headings | Reference | 2008-04-06 |
| LOUIS | US federal documents database | Government | 2007-06-29 |
| Maplight | Government database linking contributions and votes | Government | 2007-11-04 |
| NHS | UK National Health Service | Medical | 2008-07-03 |
| NOAA Weather Service | Weather forecast database | Weather | 2005-09-08 |
| Office for National Statistics | UK neighborhood and census data | Government | 2008-07-03 |
| Open Patent Services | European Patent Office web services | Government | 2007-06-26 |
| OpenSecrets | U.S. political data lookup | Government | 2008-08-21 |
| Project Vote Smart | U.S. political data lookup | Politics | 2008-07-13 |